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Crew unaware of wind changes: MD-90 suffers runway excursion in Taiwan
6 May 2012

Graphic of runway excursion (ASC)

Investigators from the Aviation Safety Council (ASC) of Taiwan concluded that a sudden change in wind speed caused an MD-90 passenger plane to suffer a runway excursion incident in May 2011.

On May 12, 2011 a McDonnell Douglas MD-90, wet leased to EVA Airways, was on a scheduled passenger flight from Macau Airport to Taoyuan International Airport of Taiwan. There were 2 flight crew members, 5 cabin crew members, and 127 passengers on board.
The aircraft landed at 20:36 at Taoyuan International Airport runway 06. During landing, the right main gear veered off the runway at 3340 feet from runway 06 threshold, then back to the runway at 5,100ft. After the aircraft  arrived at the parking bay, inspection found that the aircraft had minor damage, all people on board were safe.

The investigation learned that, during landing, there was 10 to 20 knots left crosswind below 500ft; the flight crew were not acknowledged of dramatic change of wind speed before landing. The ground spoilers were not promptly extended after landing, which failed to minimize the wing lift to reduce the aircraft drift to the right from the low level wind impact. After landing, the left crosswind increased to maximum 18 knots which increased the lift of the left wing which made the aircraft drift to the right; the flight crew did not promply use reverser to overcome the weathervane effect, which made the aircraft veer off the runway.

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